Answer: add the lengths and multiply the height and width
The proportion that can be used to find the length of side CD is <span>ABCD</span><span> = </span><span>AXCX</span><span>. Side AB corresponds to side CD and side AX corresponds to side CX.</span>
So the formula for the circumference of a circle is π x diameter
Since we know the the circumference already, we just divide that by π:
12π / π = 12
Now we halve the diameter to get the radius:
12 / 2 = 6
The area of a circle is π x radius²
So the area is:
·π x 6² = 36π· (or 113 not in terms of π)